Nail care products

ABSTRACT

The present invention relates to a nail-care composition.  
     It is an object of the present invention to provide a solvent based nail-care composition which can be easily applied to nails, provides a film (coating film) on the nail with excellent strength and gloss, and generates a coating film that is difficult to peel off over time and free from loss of gloss.  
     The means used to meet the objective is a nail-care composition comprising (a) nitrocellulose, (b) neopentyl glycol trimellitate adipate polyester resin, (c) one, two, or more members selected from the group consisting of alkyl methacrylate-alkyl acrylate copolymers, sucrose benzoate, and a polymer compound having a glass transition temperature of 50-80° C., and (d) a solvent.  
     The present invention provides a solvent-based nail-care composition which is easy to apply, excellent in the strength of film(coating film) on the nail and gloss, difficult to peel off over a period of time, and free from the loss of gloss.

TECHNICAL FIELD

[0001] The present invention relates to a nail-care composition. Itfurther relates to a solvent-based nail-care composition which is easilyapplied to nails, provides a film (coating film) on the nail withexcellent strength and gloss, and generates a coating film which isdifficult to peel off over time and free from loss of gloss.

PRIOR ART

[0002] Solvent-based nail-care compositions have conventionally beenformulated with a variety of resins for improving properties such as theease of application, gloss, peeling off characteristics, and the like.Among them, there are many technologies of formulating nitrocellulose asa film-forming agent: for example, Japanese Patent Laid-Open PublicationNo. S61-246113 discloses a nail-care composition with improved peelingoff characteristics and the like by formulating in anitrocellulose-containing nail-care composition, a combination of amodified alkyd resin such as a glycidyl versatate ester modified-alkydresin and sucrose benzoate. Japanese Patent Laid-Open Publication No.H5-213719 discloses a nail-care composition that improves on the artdescribed in the above Japanese Patent Laid-Open Publication No.S61-246113 by incorporating a silicone-based grafted copolymer.

[0003] There have also been a number of developments of film-formingagents replacing nitrocellulose: Japanese Patent Laid-Open PublicationNo. S54-129137 discloses a nail-care composition containing, as a filmforming agent, a blend of acrylic resins (a preferred number averagemolecular weight of 15,000-2000,000) from a methacrylate ester copolymercomprised of 35-65% by weight of methyl methacrylate and/or ethylmethacrylate and 65-35% by weight of propyl methacrylate and/or butylmethacrylate and a methacrylate ester/acrylate ester copolymer comprisedof 50-85% by weight of methyl methacrylate and/or ethyl methacrylate and50-15% by weight of methyl acrylate and/or ethyl acrylate. JapanesePatent Laid-Open Publication No. H6-279239 discloses a nail-carecomposition using as a film-forming agent, a copolymer having amolecular weight of 10,000-70,000 comprised of 20-85% by weight ofstyrene and/or methyl methacrylate, 5-60% by weight of an alkyl acrylateester (the alkyl chain length of 1-8), and 7-30% by weight of acrylicacid.

[0004] Thus, research and development has been intense on products aimedat improving the properties required of nail-care compositions. Inparticular, with an increasing demand for an even higher qualitynail-care composition by consumers, along with diversification ofpreferences, there are ever increasing demands for nail-care compositionhaving many excellent properties combined therein. It is an object ofthe present invention, in response to the above state of art, to providea solvent-based nail-care composition which is easily applied to nails,provides a film (coating film) on the nail with excellent strength andgloss, and generates a coating film that is difficult to peel off overtime and free from loss of gloss.

DISCLOSURE OF THE INVENTION

[0005] As a result of their extensive studies of a way to solve theabove problem, the present inventors discovered that the above problemscan be overcome by formulating in combination a specific polyester resinalong with a specific acrylic resin, sucrose derivative, or a polymercompound having a specific glass transition temperature in anitrocellulose-containing solvent-based nail-care composition, which hasresulted in the completion of the present invention.

[0006] That is, the present invention is a nail-care compositioncomprising (a) nitrocellulose, (b) neopentyl glycol trimellitate adipatepolyester resin, (c) one, two, or more members selected from the groupconsisting of alkyl methacrylate-alkyl acrylate copolymers, sucrosebenzoate, and a polymeric compound having a glass transition temperatureof 50-80° C., and (d) a solvent. It is preferred for the neopentylglycol trimellitate adipate polyester resin to have an acid value of10-30 mgKOH/g. The composition within this range can exhibit a furthersubstantial effect of preventing the coating film from peeling overtime.

[0007] It is preferred for the alkyl group in the alkyl methacrylate andalkyl acrylate constituting the alkyl methacrylate-alkylacrylate-containing copolymer to have 1-8 carbon atoms. Within thisrange, the coating film strength and gloss development effects can bemade more substantial.

[0008] The alkyl methacrylate-alkyl acrylate-containing copolymerpreferably has a weight average molecular weight of 1,000-9,000.Polymers within this range can provide excellent coating film strengthand gloss as well as the excellent effect of preventing the coating filmfrom peeling off over time. The ease of application will also beexcellent.

EMBODIMENTS OF THE PRESENT INVENTION

[0009] Hereafter, embodiments of the present invention are described indetail.

[0010] (a) Component nitrocellulose may be one or a combination of twoor more types from those conventionally used and known in the art.Nitrocelluloses, for example, include nitrocellulose {fraction (1/16)}sec, nitrocellulose ⅛ sec, nitrocellulose ¼ sec, nitrocellulose ½ sec,nitrocellulose 1 sec, nitrocellulose 2 sec, nitrocellulose 7 sec,nitrocellulose 20 sec, and the like. From among these, nitrocellulose{fraction (1/16)} sec, nitrocellulose ⅛ sec, nitrocellulose ¼ sec arepreferred.

[0011] The amount of nitrocellulose formulated should be determined inconsideration of the other formulated components, but it shouldpreferably be 5-25% be weight of the entire weight of the nail-carecomposition as wetted with 30% by weight isopropyl alcohol (hereafter,30% IPA). At a level below 5% by weight there is the danger of losingthe gloss over time, but a level exceeding 25% by weight might make thecoating difficult. A particularly preferred range is 10-20% by weight.At a level within this range, the effect of the present invention can befully developed.

[0012] (b) Component neopentyl glycol trimellitate adipate polyesterresin is a polyester obtained by treating trimellitic acid, neopentylglycol, and adipic acid. Different ratios of the 3 components willprovide polymers with different physical properties, but the preferredproduct has an acid value of 10-30 mg KOH/g. Within this range, thecomposition can provide a greater effect of preventing the coating filmfrom peeling off. The neopentyl glycol trimellitate adipic polyesterresin in this invention is hereafter called the “adipate polyesterresin.” For the adipate polyester resin component, it is permissible,for example, to use a commercially available product under thedesignation “UNIPLEX 670-P [(Manufactured by UNITEX ChemicalCorporation).

[0013] The amount of the adipate polyester resin to be formulated isdetermined in consideration of other formulated components, but itshould preferably be 3.0-20.0% by weight of the entire nail-carecomposition. A level less than 3.0% by weight tends to adversely affectthe effect on peeling over time while a level exceeding 20.0% by weighttends to adversely affect the gloss and the strength. A particularlypreferred range is 5-15% by weight. Within this range, the effect of thepresent invention can be fully developed.

[0014] The alkyl methacrylate and alkyl acrylate constituting the (c)component alkyl methacrylate-alkyl acrylate copolymer should have alkylgroups preferably containing 1-8 carbon atoms. Within this range, thecoating film strength and gloss development effect can be more fullydeveloped.

[0015] The alkyl methacrylates are, for example, methyl methacrylate,ethyl methacrylate, propyl methacrylate, butyl methacrylate, octylmethacrylate, 2-ethylhexyl methacrylate, and the like: the alkylacrylates are, for example, methyl acrylate, ethyl acrylate, propylacrylate, butyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, and thelike. Monomers other than the alkyl methacrylate and alkyl acrylateconstituting the alkyl methacrylate-alkyl acrylate containing copolymersinclude styrene, methacrylic acid, acrylic acid, acrylonitrile, and thelike, but use of them is not necessarily required.

[0016] The alkyl methacrylate-alkyl acrylate containing copolymers aresynthesized by a conventional manufacturing method. The copolymer is,for example, obtained by radical polymerization of monomers constitutingthe copolymer. Obviously, it is permissible to use a commercialcopolymer which, for example, includes JONCRYL611 (sold by JohnsonPolymer Co., Ltd.) and the like. JONCRYL 611 is a polymeric compoundhaving a glass transition temperature of 64° C. The alkylmethacrylate-alkyl acrylate copolymer may be formulated singly or as acombination of 2 or more.

[0017] The molecular weight of the alkyl methacrylate-alkylacrylate-containing copolymer is preferably 1,000-20,000 in weightaverage molecular weight. In particular, a low molecular weight range of1,000-9,000 is preferred for substantially attaining the effect of thisinvention. Within this range, the polymer will provide outstandingcoating film strength and gloss as well as substantial effect ofpreventing coating film from peeling off over time.

[0018] The amount of the alkyl methacrylate-alkyl acrylate-containingcopolymer to be formulated is determined by the physical properties ofthe copolymer and in relation to the other formulated components, but isshould preferably be 1-25% by weight of the total weight of thenail-care composition. A level less than 1% by weight will cause thefilm strength to decrease, with the danger of a decrease in gloss overtime, whereas a level exceeding 25% by weight tends to adversely affectthe effect on peeling with time, along with the danger of making itdifficult to apply. A particularly preferred range is 8-20% by weight.Within this range, the effect of this invention can be fully developed.

[0019] Sucrose benzoate, another component of (c) used in thisinvention, is one of the conventionally known nail-care resins. It ispermissible to use a commercial sucrose benzoate which, for example,includes a product manufactured by Dai-Ichi Kogyo Seiysku Co., Ltd underthe trade name MONOPET SB and Sucrose benzoate (a product manufacturedby Velsicol Chemical Corporation, USA) and the like. MONOPET SB(manufactured by Dai-Ichi Kogyo Seiyaku Co., Ltd.) is a polymericcompound having a glass transition temperature of 64° C.

[0020] The amount of sucrose benzoate formulated should be determined inrelation to the other formulated components and is preferably in a rangeof 0.5-25% by weight of the total weight of the nail-care composition. Alevel less than 0.5% by weight will result in the danger of reducing thefilm strength and decreasing the gloss over time. A level exceeding 25%by weight tends to adversely affect the effect on peel over time, alongwith the danger of making the coating difficult. A further preferredrange is 3-15% by weight. Within this range, the effect of thisinvention can be fully developed.

[0021] Another component of (c) in this invention is a polymericcompound having a glass transition temperature of 50-80° C. It ispreferably a polymeric compound having a glass transition temperature of55-75° C. Incidentally, the glass transition temperature is determinedusing a DSC instrument, (differential scanning calorimeter) (SSC5100), aproduct of Seiko Instrument Company) using a 10 mg sample at a heatingrate of 5° C./minute over a range of −20° C.-120° C. and determining,from the chart obtained, the temperature at which the DSC peak begins torise as the glass transition temperature. Among the (c) componentsmentioned above, there are included those with glass transitiontemperatures of 50-80° C., but it is permissible to use a polymericcompound outside of that range. A polymeric compound having a glasstransition temperature of 50-80° C. is formulated singly or incombination of 2 or more.

[0022] The amount of a polymer having a glass transition temperature of50-80° C. to be formulated is determined in relation to the otherformulated components, but it is preferably in a range of 05-25% byweight of the total weight of the nail-care composition. A level lessthan 0.5% by weight will result in the danger of reduced film strengthand a decrease in gloss over time, while a level exceeding 25% by weighttends to adversely affect the effect on peel over time, along with thedanger of making the application difficult. A further preferred range is3-15% by weight. Within this range, the effect of the present inventioncan be fully developed.

[0023] If (c) components, alkyl methacrylate-alkyl acrylate containingcopolymer, sucrose benzoate, and a polymeric compound having a glasstransition temperature of 50-80° C., are used as a mixture, the totalweight of the three formulated should preferably be not more than 25% byweight.

[0024] (d) component solvents may be conventionally known esters,alcohols, hydrocarbon types, and the like. For example, they includemethyl acetate, ethyl acetate, butyl acetate, amyl acetate, ethyllactate, butyl lactate, ethyl alcohol, isopropyl alcohol, butyl alcohol,toluene, isobutyl acetate, propyl acetate, isopropyl acetate, propylalcohol, and the like. In particular, it is preferred to use butylacetate, ethyl acetate, isopropyl alcohol, butyl alcohol, ethyl alcohol,and the like. The solvent may be used singly or in combination of 2 ormore.

[0025] The amount of the solvent formulated differs, depending upon itsbehavior in use, color, and the like, but it is generally about 50-85%by weight of the total nail-care composition.

[0026] In addition to the above components, the nail-care composition ofthis invention may be formulated optionally, to the extent of notadversely affecting the effect of this invention, with ingredients whichare generally formulated in nail-care compositions, such as resins otherthan the above essential resin components of this invention,plasticizers, pigments, fragrances, dyes, pearlescent agent, lamellas,humectants, UV absorbers, delusterant, fillers, surfactants, viscosityimprovers, metal soaps, clay modifiers such as organic acids, and thelike. Among these, it is preferred to incorporate a plasticizer in thenail-care composition of this invention for improving coating filmproperties such as peeling off, coating film strength, and the like.

[0027] Plasticizers used may be selected from known types such ascamphor, phthalate esters, and citrate esters. For example, dibutylphthalate, dioctyl phthalate, tributyl citrate, acetyltriethyl citrate,acetyltributyl citrate, and the like can be mentioned. One, two, or moremay be selected from these without limitation. The amount formulated isin general, 1-10% by weight of the total nail-care composition.

[0028] Resins other than the essential resins of this invention includemodified alkyd resins such as glycidyl vasatate, toluene sulfonamideresin, sucrose acetate-isobutyrate ester, a silicone-grafted copolymer,and the like. Formulating these resins can further enhance the peelcharacteristics and the absence of the feeling of compression to thenail without adversely affecting the ease of coating, gloss, and thelike.

[0029] These resins are preferably formulated in an amount of 0.1-10% byweight of the total nail-care composition.

[0030] The solvent-based nail-care composition of this inventionincludes, but not limited to, a broad range of nail coating agentscommonly used in the cosmetic industry as manicures and nail-careingproducts, such as base coats, nail enamels, top coats (over coats) andnail care products such as nail guards and the like, without beinglimited to these examples.

[0031] The present invention is further explained in details based onworking examples of this invention. Incidentally, the amount formulatedis expressed in percent by weight.

[0032] Prior to the explanation of the examples of this invention, thevarious evaluation methods used in these examples are explained asbellow.

[0033] [Ease of Application]

[0034] Each sample filled in a 10 ml glass bottle having an attachedbrush was applied by a 20-member professional panel to individual'snails (one coat, two coats); ease of application in coating was rated in5 grades. Individual's grade points were totaled. A rating standard willbe summarized later. (Rating Points) 5 Points: Very smooth application 4Points: Smooth application 3 Points: Ordinary level 2 Points: Difficultyin application 1 Point: Much difficulty in application

[0035] [Coating Film Strength]

[0036] Each sample filled in a 10 ml glass bottle having an attachedbrush was applied by a 20-member professional panel to individual'snails; the extent of chipping of the nail-coating film after spending 4days in living environmental conditions was rated in 5 grades.Individual's grade points were totaled. A rating standard will besummarized later. (Rating Points) 5 Points: Very difficult to chip 4Points: Difficult to chip 3 Points: Ordinary level 2 Points: Easy tochip 1 Point: Very easy to chip

[0037] [Gloss]

[0038] Each sample filled in a 10 ml glass bottle having an attachedbrush was applied by a 20-member professional panel to individual'snails; the gloss of the coating film after spending 4 days in livingenvironmental conditions was rated in 5 grades. Individual's gradepoints were totaled. A rating standard will be summarized later. (RatingPoints) 5 Points: Very glossy 4 Points: Glossy 3 Points: Ordinary level2 Points: Not glossy 1 Point: Very non-glossy

[0039] [Peeling off Over a Period of Time]

[0040] Each sample filled in a 10 ml glass bottle with an attached brushwas applied by a 20-member professional panel to individual's nails; theextent of the peeling off of nail-coating films after spending 4 days inliving environmental conditions was rated in 5 grades. Individual'sgrade points were totaled. A rating standard will be summarized later.(Rating Points) 5 Points: Very difficult to peel 4 Points: Difficult topeel 3 Points: Regular 2 Points: Easy to peel 1 Point: Very easy to peel

[0041] (Evaluation Standards for the Above Test Items) ⊚ A point totalis 90 points or greater. ◯ A point total is 70 points or higher but lessthan 90 points. □ A point total is 50 points or higher but less than 70points Δ A point total is 50 points or higher but less than 70 points XA point total is less than 30 points.

EXAMPLES 1-45 Comparative Examples 1-4

[0042] Nail-care compositions were prepared by the usual methodaccording to the recipes listed in Tables 1-10 and were individuallyevaluated by the above evaluation methods in terms of ease ofapplication, coating film strength, gloss, and peeling off over time.The results are respectively given in Tables 1-10. TABLE 1 ExamplesComparative Ex. 1 2 3 1 2 3 4 Nitrocellulose ¼ 12 12 12 12 12 12 12 sec(30% IPA) (a) Adipate polyester 10 10 10 10 — — — resin (b) Methylmethacrylate- 10 — — — 10 — — butyl acrylate Copolymer (c) Sucrose — 10— — — 10 — benzoate (c) JONCRYL 611 (c) — — 10 — — — 10 Acetyltriethyl 55 5 5 5 5 5 citrate n-Butyl alcohol 1 1 1 1 1 1 1 Ethyl acetate 20 20 2020 20 20 20 n-Bulyl acetate Bal* Bal Bal Bal Bal Bal Bal OrganicallyOpt* Opt Opt Opt Opt Opt Opt modified clay mineral Pearlescent 2 2 2 2 22 2 agent Pigment 1 1 1 1 1 1 1 Ease of ⊚ ⊚ ⊚ ◯ Δ Δ Δ applicationCoating film ⊚ ⊚ ⊚ Δ ◯ ◯ ◯ strength Gloss 10 min. later ⊚ ⊚ ⊚ Δ ◯ ◯ ◯ 4days later ◯ ◯ ◯ Δ ▪ ▪ ▪ Peeling off ⊚ ⊚ ⊚ ◯ X X X over time

[0043] In Table 1, the adipate polyester resin was UNIPLEX 670-P. Themethyl methacrylate-butyl acrylate copolymer had a weight averagemolecular weight of 8,100.

[0044] Table 1 clearly shows that Example 1, a formulation ofnitrocellulose ¼ second, adipate polyester resin, and methylmethacrylate-butyl acrylate copolymer: Example 2, a formulation ofnitrocellulose ¼ second, adipate polyester resin, and sucrose benzoate;and Example 3, a formulation of nitrocellulose ¼ second, adipatepolyester resin, and JONCRYL 611 are all outstanding in every item: easeof application, coating film strength, gloss, and peeling off over time.

[0045] On the other hand, Comparative Example 1, a formulation with no(c) component is shown to have insufficient coating film strength andgloss. Comparative Examples 2, 3, and 4, formulations lacking (b)component, adipate polyester resin, are shown to be particularlyinsufficient in ease of coating and peeling off over time. TABLE 2Examples 4 5 6 7 Nitrocellulose ¼ sec 5 10 20 25 (30% IPA) (a) Adipatepolyester resin (b) 10 10 10 10 Methyl methacrylate-butyl 10 10 10 10acrylate Copolymer (c) Acetyltriethyl citrate 5 5 5 5 n-Butyl alcohol 11 1 1 Ethyl acetate 20 20 20 20 n-Bulyl acetate Bal Bal Bal BalOrganically modified Opt Opt Opt Opt clay mineral Pearlesccnt Agent 2 22 2 Pigment 1 1 1 1 Ease of Application ⊚ ⊚ ⊚ ◯ Coating film strength ◯⊚ ⊚ ⊚ Gloss 10 min. later ◯ ⊚ ⊚ ⊚ 4 days later ◯ ◯ ◯ ◯ Peeling off overtime ◯ ⊚ ⊚ ◯

[0046] In Table 2, the adipate polyester resin was UNIPLEX 670-P. Themethyl methacrylate-butyl acrylate copolymer had a weight averagemolecular weight of 8,100.

[0047] Table 2 clearly shows that excellent effects are obtained whenthe amount of nitrocellulose formulated is in a range of 5-25% byweight. It particularly shows that a range of 10-20% by weight ispreferred. TABLE 3 Examples 8 9 10 11 Nitrocellulose ¼ sec 5 10 20 25(30% IPA) (a) Adipate ester resin (b) 10 10 10 10 Sucrose benzoate (c)10 10 10 10 Acetyltriethyl citrate 5 5 5 5 n-Butyl alcohol 0.5 0.5 0.50.5 Ethyl acetate 20 20 20 20 n-Butyl acetate Bal Bal Bal BalOrganically modified Opt Opt Opt Opt clay mineral Pearlescent agent 2 22 2 Pigment 1 1 1 1 Ease of application ⊚ ⊚ ⊚ ◯ Coating film strength ◯⊚ ⊚ ⊚ Gloss 10 min. later ◯ ⊚ ⊚ ⊚ 4 days later ◯ ◯ ◯ ◯ Peeling off overtime ◯ ⊚ ⊚ ◯

[0048] In Table 3, the adipate polyester resin was UNIPLEX 670-P. Table3 clearly shows that excellent effect is obtained when the amount ofnitrocellulose formulated is in a range of 5-25% by weight. Itparticularly shows that a range of 10-20% by weight is preferred. TABLE4 Examples 12 13 14 15 Nitrocellulose ¼ sec 5 10 20 25 (30% IPA) (a)Adipate polyester resin (b) 10 10 10 10 JONCRYL 611 (c) 10 10 10 10Acetyltriethyl citrate 5 5 5 5 n-Butyl alcohol 0.5 0.5 0.5 0.5 Ethylacetate 20 20 20 20 n-Butyl acetate Bal Bal Bal Bal Organically modifiedOpt Opt Opt Opt clay mineral Pearlescent Agent 2 2 2 2 Pigment 1 1 1 1Ease of application ⊚ ⊚ ⊚ ◯ Coating film strength ◯ ⊚ ⊚ ⊚ Gloss 10 min.later ◯ ⊚ ⊚ ⊚ 4 days later ◯ ◯ ◯ ◯ Peeling off over time ◯ ⊚ ⊚ ◯

[0049] In Table 4, the adipate polyester resin was UNIPLEX 670-P. Table4 clearly shows that excellent effects are obtained when the amount ofnitrocellulose formulated is in a range of 5-25% by weight. Itparticularly shows that a range of 10-20% by weight is preferred. TABLE5 Examples 16 17 18 19 20 Nitrocellulose ¼ sec 12 12 12 12 12 (30% IPA)(a) Adipate polyester resin (b) 3 5 7 15 20 Methyl methacrylate-butyl 1010 10 10 10 acrylate Copolymer (c) Acetyltriethyl citrate 5 5 5 5 5n-Butyl alcohol 1 1 1 1 1 Ethyl acetate 20 20 20 20 20 n-Butyl acetateBal Bal Bal Bal Bal Organically modified clay Opt Opt Opt Opt Optmineral Pearlescent Agent 2 2 2 2 2 Pigment 3 3 3 3 3 Ease ofapplication ⊚ ⊚ ⊚ ⊚ ⊚ Coating film strength ⊚ ⊚ ⊚ ⊚ ◯ Gloss 10 min.later ⊚ ⊚ ⊚ ⊚ ◯ 4 days later ◯ ◯ ◯ ◯ ◯ Peeling off over time ◯ ⊚ ⊚ ⊚ ⊚

[0050] In Table 5, the adipate polyester resin was UNIPLEX 670-P. Themethyl methacrylate-butyl acrylate copolymer had a weight averagemolecular weight of 8,000.

[0051] Table 5 clearly shows that excellent effects are obtained if theamount of adipate polyester resin formulated is in a range of 3-20% byweight. It particularly shows that a range of 5-15% by weight ispreferred. TABLE 6 Examples 21 22 23 24 25 Nitrocellulose ¼ sec 12 12 1212 12 (30% IPA) (a) Adipate polyester resin (b) 3 5 7 15 20 Sucrosebenzoate (c) 10 10 10 10 10 Acetyltriethyl citrate 5 5 5 5 5 n-Butylalcohol 1 1 1 1 1 Ethyl acetate 20 20 20 20 20 n-Butyl acetate Bal BalBal Bal Bal Organically modified clay Opt Opt Opt Opt Opt mineralPearlescent Agent 2 2 2 2 2 Pigment 1 1 1 1 1 Ease of application ◯ ⊚ ⊚⊚ ◯ Coating film strength ⊚ ⊚ ⊚ ⊚ ◯ Gloss 10 min. later ◯ ⊚ ⊚ ⊚ ⊚ 4 dayslater ◯ ◯ ◯ ◯ ◯ Peeling off over time ◯ ⊚ ⊚ ⊚ ⊚

[0052] In Table 6, the adipate polyester resin was UNIPLEX 670-P. Table6 clearly shows that excellent effects are obtained if the amount ofadipate polyester resin formulated is in a range of 3-20% by weight. Itparticularly shows that a range of 5-15% by weight is preferred. TABLE 7Examples 26 27 28 29 30 Nitrocellulose ¼ sec 12 12 12 12 12 (30% IPA)(a) Adipate polyester resin (b) 3 5 7 15 20 JONCRYL 611 (c) 10 10 10 1010 Acetyltriethyl citrate 5 5 5 5 5 n-Butyl alcohol 1 1 1 1 1 Ethylacetate 20 20 20 20 20 n-Butyl acetate Bal Bal Bal Bal Bal Organicallymodified clay Opt Opt Opt Opt Opt mineral Pearlescent Agent 2 2 2 2 2Pigment 1 1 1 1 1 Ease of application ◯ ⊚ ⊚ ⊚ ◯ Coating film strength ⊚⊚ ⊚ ⊚ ◯ Gloss 10 min. later ◯ ⊚ ⊚ ⊚ ⊚ 4 days later ◯ ◯ ◯ ◯ ◯ Peeling offover time ◯ ⊚ ⊚ ⊚ ⊚

[0053] In Table 7, the adipate polyester resin was UNIPLEX 670-P. Table7 clearly shows that excellent effects are obtained if the amount ofadipate polyester resin formulated is in a range of 3-20% by weight. Itparticularly shows that a range of 5-15% by weight is preferred. TABLE 8Examples 31 32 33 34 35 Nitrocellulose ¼ sec 10 10 10 10 10 (30% IPA)(a) Adipate polyester resin (b) 10 10 10 10 10 Methyl methacrylate-butyl1 8 15 20 25 acrylate Copolymer (c) Acetyltriethyl citrate 5 5 5 5 5n-Butyl alcohol 1 1 1 1 1 Ethyl acetate 20 20 20 20 20 n-Butyl acetateBal Bal Bal Bal Bal Organically modified clay Opt Opt Opt Opt Optmineral Pearlescent Agent 2 2 2 2 2 Pigment 3 3 3 3 3 Ease ofapplication ⊚ ⊚ ⊚ ⊚ ◯ Coating film strength ◯ ⊚ ⊚ ⊚ ⊚ Gloss 10 min.later ◯ ⊚ ⊚ ⊚ ⊚ 4 days later ◯ ◯ ◯ ◯ ◯ Peeling offover time ⊚ ⊚ ⊚ ⊚ ◯

[0054] In Table 8 the adipate polyester resin was UNIPLEX 670-P. Themethyl methacrylate-butyl acrylate copolymer had a weight averagemolecular weight of 8,000.

[0055] Table 8 clearly shows that excellent effects are obtained if theamount of the methyl acrylate butyl acrylate copolymer formulated is ina range of 1-25% by weight. It particularly shows that a range of 8-20%by weight is preferred. TABLE 9 Examples 36 37 38 39 40 Nitrocellulose ¼sec 10 10 10 10 10 (30% IPA) (a) Adipate polyester resin (b) 10 10 10 1010 Sucrose benzoate (c) 0.5 3 6 15 25 Acetyltriethyl citrate 5 5 5 5 5n-Butyl alcohol 1 1 1 1 1 Ethyl acetate 20 20 20 20 20 n-Butyl acetateBal Bal Bal Bal Bal Organically modified clay Opt Opt Opt Opt Optmineral Pearlescent Agent 2 2 2 2 2 Pigment 1 1 1 1 1 Ease ofapplication ⊚ ⊚ ⊚ ⊚ ◯ Coating film strength ◯ ⊚ ⊚ ⊚ ⊚ Gloss 10 min.later ◯ ⊚ ⊚ ⊚ ⊚ 4 days later ◯ ◯ ◯ ◯ ◯ Peeling off over time ⊚ ⊚ ⊚ ⊚ ◯

[0056] In Table 9, the adipate polyester resin was UNIPLEX 670-P. Table9 clearly shows that excellent effects are obtained if the amount ofsucrose benzoate formulated is in a range of 0.5-25% by weight. Itparticularly shows that a range of 3-15% by weight is preferred. TABLE10 Examples 41 42 43 44 45 Nitrocellulose ¼ sec 10 10 10 10 10 (30% IPA)(a) Adipate polyester resin (b) 10 10 10 10 10 JONCRYL 611 (c) 0.5 3 615 25 Acetyltriethyl citrate 5 5 5 5 5 n-Butyl alcohol 1 1 1 1 1 Ethylacetate 20 20 20 20 20 n-Butyl acetate Bal Bal Bal Bal Bal Organicallymodified clay Opt Opt Opt Opt Opt mineral Pearlescent Agent 2 2 2 2 2Pigment 1 1 1 1 1 Ease of application ⊚ ⊚ ⊚ ⊚ ◯ Coating film strength ◯⊚ ⊚ ⊚ ⊚ Gloss 10 min. later ◯ ⊚ ⊚ ⊚ ⊚ 4 days later ◯ ◯ ◯ ◯ ◯ Peeling offover time ⊚ ⊚ ⊚ ⊚ ◯

[0057] In Table 10, the adipate polyester resin was UNIPLEX 670-P.

[0058] Table 10 clearly shows that excellent effects are obtained if theamount of JONCRYL 611 formulated is in a range of 0.5-25% by weight. Itparticularly shows that a range of 3-15% by weight is preferred.

[0059] Nail enamels for Examples 46-54 were prepared by the usual methodas below. All enamels were excellent in ease of application, coatingfilm strength, and gloss and difficult to peel. They all had good dryingcapability and exerted minimal feeling of compression on the nail.

EXAMPLE 46 Nail Enamel

[0060] (Formulation components) (Amount formulated) Nitrocellulose ¼second (30% IPA) 15% by weight Adipate polyester resin 5 Methylmethacrylate-butyl acrylate- 20 2-ethylhexyl methacrylate copolymerAcetyltriethyl citrate 5 n-Butyl alcohol 1 Ethyl acetate 20 n-Butylacetate balance Pigment 1 Organically modified clay mineral optimum

[0061] The adipate polyester resin was UNIPLEX 670-P. The methylmethacrylate-butyl methacrylate-2-ethylhexyl methacrylate copolymer hada weight average molecular weight of 8,000.

EXAMPLE 47 Nail Enamel

[0062] (Formulation components) (Amount formulated) Nitrocellulose ¼second (30% IPA) 15% by weight Adipate polyester resin 10 Methylmethacrylate-butyl acrylate- 8  2-ethylhexyl methacrylate copolymerAcetyltriethyl citrate 5 n-Butyl alcohol 1 Ethyl acetate 20 n-Butylacetate balance Pigment 1 Organically modified clay mineral optimum

[0063] The adipate polyester resin was UNIPLEX 670-P. The methylmethacrylate-butyl methacrylate-2-ethylhexyl methacrylate copolymer hada weight average molecular weight of 8,100.

EXAMPLE 48 Nail Enamel

[0064] (Formulation components) (Amount formulated) Nitrocellulose ½second (30% IPA) 10% by weight Adipate polyester resin 15 Octylmethacrylate-methyl acrylate- 15 methacrylic acid copolymer Modifiedalkyd resin 10 Acetyltriethyl citrate 5 n-Butyl alcohol 1 Ethyl acetate20 n-Butyl acetate balance Pigment 1 Organically modified clay mineraloptimum

[0065] The adipate polyester resin was UNIPLEX 670-P. The octylmethacrylate-methyl acrylate-methacrylic acid copolymer had a weightaverage molecular weight of 8,100.

EXAMPLE 49 Nail Enamel

[0066] (Formulation components) (Amount formulated) Nitrocellulose ¼second (30% IPA) 10% by weight Adipate polyester resin 5 Methylmethacrylate-butyl acrylate-copolymer 8 Sucrose benzoate 3 Toluenesulfonamide 4 Acetyltriethyl citrate 5 n-Butyl alcohol 1 Ethyl acetate20 n-Butyl acetate balance Pigment 1 Organically modified clay mineraloptimum

[0067] The adipate polyester resin was UNIPLEX 670-P. The methylmethacrylate-butyl acrylate copolymer had a weight average molecularweight of 5,000.

EXAMPLE 50 Nail Enamel

[0068] (Formulation components) (Amount formulated) Nitrocellulose ½second (30% IPA) 15% by weight Adipate polyester resin 10 Sucrosebenzoate 9 Acetyltriethyl citrate 5 n-Butyl alcohol 1 Ethyl acetate 20n-Butyl acetate balance Pigment 1 Organically modified clay mineraloptimum

[0069] The adipate polyester resin was UNIPLEX 670-P.

EXAMPLE 51 Nail Enamel

[0070] (Formulation components) (Amount formulated) Nitrocellulose ¼second (30% IPA) 18% by weight Adipate polyester resin 15 Sucrosebenzoate 15 Acetyltriethyl citrate 5 n-Butyl alcohol 1 Ethyl acetate 20n-Butyl acetate balance Pigment 1 Organically modified clay mineraloptimum

[0071] The adipate polyester resin was UNIPLEX 670-P.

EXAMPLE 52 Nail Enamel

[0072] (Formulation components) (Amount formulated) Nitrocellulose ½second (30% IPA) 5% by weight Nitrocellulose ⅛ second (30% IPA) 12Adipate polyester resin 12 Sucrose benzoate 2 Acetyltriethyl citrate 5Pigment 1 Organically modified clay mineral optimum n-Butyl alcohol 0.5Ethyl acetate 8.5 n-Butyl acetate balance Citric acid optimum

[0073] The adipate polyester resin was UNIPLEX 670-P.

EXAMPLE 53 Nail Enamel

[0074] (Formulation components) (Amount formulated) Nitrocellulose ½second (30% IPA) 5% by weight Nitrocellulose {fraction (1/16)} second(30% IPA) 13 Adipate polyester resin 12 Sucrose benzoate 2Acetyltriethyl citrate 5 Pigment 1 Organically modified clay mineraloptimum n-Butyl alcohol 0.5 Ethyl acetate 8.5 n-Butyl acetate balanceCitric acid optimum

[0075] The adipate polyester resin was UNIPLEX 670-P.

EXAMPLE 54 Nail Enamel

[0076] (Formulation components) (Amount formulated) Nitrocellulose ¼second (30% IPA) 7% by weight Nitrocellulose ½ second (30% IPA) 5Adipate polyester resin (*1) 8 Alkyl methacrylate-alkyl acrylateCopolymer (*2) 8 Sucrose benzoate (*3) 4 Toluene sulfonamide resin 4Acetyltriethyl citrate 5 n-Butyl alcohol 1 Ethyl acetate 20 n-Butylacetate balance Pigment 1 Organically modified clay mineral optimum

EXAMPLE 55 Overcoat

[0077] (Formulation components) (Amount formulated) Nitrocellulose ½second (30% IPA) 12% by weight Adipate polyester resin 10 Methylmethacrylate-butyl acrylate-copolymer 10 Sucrose benzoate 5 Toluenesulfonamide resin 4 Acetyltriethyl citrate 5 n-Butyl alcohol 1 Ethylacetate 25 n-Butyl acetate balance Pigment 1 Organically modified claymineral optimum

[0078] An overcoat was prepared by the usual method. It was excellent inease of application, coating film strength, and gloss and difficult topeel even over a period of time, and the gloss was not lost. It also hadgood drying capability and exerted minimal feeling of compression on thenail. Incidentally, the adipate polyester resin was UNIPLEX 670-P. Themethyl methacrylate-butyl acrylate copolymer had a weight averagemolecular weight of 8,100.

EXAMPLE 56 Overcoat

[0079] (Formulation components) (Amount formulated) Nitrocellulose ½second (30% IPA) 12% by weight Adipate polyester resin (*1) 10 Alkylmethacrylate-alkyl acrylate-Copolymer (*2) 15 Toluene sulfonamide resin4 Acetyltriethyl citrate 5 n-Butyl alcohol 1 Ethyl acetate 25 n-Butylacetate balance Pigment 1 Organically modified clay mineral optimum

[0080] An overcoat was prepared by the usual method. It was excellent inease of application, coating film strength, and gloss and difficult topeel even over a period of time, and the gloss was not lost. It also hadgood drying capability and exerted minimal feeling of compression on thenail.

EXAMPLE 57 Base Coat

[0081] (Formulation components) (Amount formulated) Nitrocellulose ¼second (30% IPA) 7% by weight Nitrocellulose ½ second (30% IPA) 5Adipate polyester resin 10 Methyl methacrylate-butyl acrylate-copolymer7 Sucrose benzoate 6 Alkyd resin (Glycidyl versatate ester-modified) 6Acetyltriethyl citrate 5 n-Butyl alcohol 1 Ethyl acetate 25 n-Butylacetate balance Pigment 1 Organically modified clay mineral optimum

[0082] A base coat was prepared by the usual method. It was excellent inease of application, coating film strength, and gloss and difficult topeel even over a period of time, and the gloss was not lost. It also hadgood drying capability and exerted minimal feeling of compression on thenail. Incidentally, the adipate polyester resin was UNIPLEX 670-P. Themethyl methacrylate-butyl acrylate copolymer had a weight averagemolecular weight of 8,100.

EXAMPLE 58 Base Coat

[0083] (Formulation components) (Amount formulated) Nitrocellulose ¼second (30% IPA) 7% by weight Nitrocellulose ½ second (30% IPA) 5Adipate polyester resin (*1) 10 Sucrose benzoate (*2) 13 Alkyd resin(Glycidyl versatate ester-modified 6 Acetyltriethyl citrate 5 n-Butylalcohol 1 Ethyl acetate 25 n-Butyl acetate balance Pigment 1 Organicallymodified clay mineral optimum

[0084] A base coat was prepared by the usual method. It was excellent inease of application, coating film strength, and gloss and difficult topeel even over a period of time, and the gloss was not lost. It also hadgood drying capability and exerted minimal feeling of compression on thenail.

Potential Industrial Utility

[0085] As described above in details, the present invention can providea solvent-based nail-care composition which is easy to apply, excellentin the strength of a film (coating film) on the nail and gloss, anddifficult to peel even over a period of time and which has a lastinggloss; accordingly, it can be used as a cosmetic preparation.

1. A nail-care composition comprising (a) nitrocellulose, (b) neopentylglycol trimellitate adipate polyester resin, (c) one, two, or moremembers selected from the group consisting of alkyl methacrylate-alkylacrylate copolymers, sucrose benzoate, and a polymeric compound having aglass transition temperature of 50-80° C., and (d) a solvent.
 2. Anail-care composition as set forth in claim 1, wherein the neopentylglycol trimellitate adipate polyester resin has an acid value of 10-30mg KOH/g.
 3. A nail-care composition as set forth in claims 1 or 2,wherein the alkyl group in the alkyl methacrylate, constituting thealkyl methacrylate-alkyl acrylate-containing copolymer, has 1-8 carbonatoms.
 4. A nail-care composition as set forth in any one of claims 1 to3, wherein the alkyl group in the alkyl acrylate, constituting the alkylmethacrylate-alkyl acrylate-containing copolymer, has 1-8 carbon atoms.5. A nail-care composition as set forth in any one of claims 1 to 4,wherein the alkyl methacrylate-alkyl acrylate-containing copolymer has aweight average molecular weight of 1,000-9,000.